Option 14 of task 12.4 from Ryabushko’s collection, related to Fourier series, now has 5 ready-made solutions, which are presented in detail and clearly. All solutions are presented in a file with a PDF extension. We thank you for your purchase! If you have any questions, please contact us via the email listed in the "seller information" section.
This digital product is a collection of tasks related to Fourier series and contains solutions to task 12.3 option 14, compiled by the author A.P. Ryabushko. This product will be useful to students and teachers studying the theory of Fourier series and their application in mathematics and physics. The HTML design of the product is made in an attractive style, which ensures ease of reading and studying the material. In addition, this product is electronic, which greatly simplifies its use and distribution. After purchasing, you will receive access to a file in PDF format, which contains detailed and understandable solutions to task 12.3 option 14 from the collection of problems by A.P. Ryabushko.
...
***
From the available description it follows that the product “Ryabushko A.P. IDZ 12.3 option 14” is not mentioned. However, perhaps this is also a collection of problems compiled by the author Ryabushko A.P. for completing individual homework (IH) in mathematics.
A more accurate description of the product requires additional information. If you know more about this product, please clarify the question and I will try to help you.
***